Description
Return center-of-pressure coordinates from moments and normal force.
Motion records combine sampled coordinates, periodic angles, event timing and signed work or impulse conventions. Local numerical differences and panels can be computed independently while actual event detection, full trajectories and physiological significance require complete measurements and analysis.
Return center-of-pressure coordinates from moments and normal force.
When to use this tool
Use Biomechanics: Force Plate Cop Coordinate when checking the stated movement timing, angle, geometry, energy or panel convention.
How to use the tool and how it works
- Enter momentX, momentY, normalForce. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read result. Expand result to inspect the returned fields.
Return center-of-pressure coordinates from moments and normal force. Require normalForce > 0; copX = -momentY/normalForce, copY = momentX/normalForce.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| momentX | Moment X | Required. Finite number. |
| momentY | Moment Y | Required. Finite number. |
| normalForce | Normal Force | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| result | Returned calculated value or nested object under the stated output convention. | Required. Object. |
| result.copX | -momentY/normalForce in the length unit implied by moment/force. | Calculated result member: number. |
| result.copY | momentX/normalForce under the supplied plate-origin convention. | Calculated result member: number. |
{
"input": {
"momentX": 20,
"momentY": -10,
"normalForce": 100
},
"output": {
"result": {
"copX": 0.1,
"copY": 0.2
}
}
}Limitations and assumptions
- This uses the stated plate-origin sign convention and compatible units; shear/height corrections and measurement validity are not assessed.
- Outputs are nested inside result. Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Inspect calibrated motion/force data and use an appropriate complete trajectory or dynamics analysis; interpret health and safe-loading implications with qualified professionals.
References
Similar or alternative tools
- Force Platform Cop Reference Gap
Return center-of-pressure coordinate gaps and Euclidean distance.
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